Phytoextraction of Cd and Zn from agricultural soils by Salix ssp. and intercropping of Salix caprea and Arabidopsis halleri

Contamination of agricultural topsoils with Cd above guideline values is of concern in many countries throughout the world. Extraction of metals from contaminated soils using high-biomass, metal-accumulating Salix sp. has been proposed as a low-cost, gentle remediation strategy, but reasonable phytoextraction rates remain to be demonstrated. In an outdoor pot experiment we assessed the phytoextraction potential for Cd and Zn of four willow species (Salixcaprea, S. fragilis, S. × smithiana, S. × dasyclados) and intercropping of S. caprea with the hyperaccumulator Arabidopsis halleri on three moderately contaminated, agricultural soils. Large concentrations of Cd (250 mg kg−1) and Zn (3,300 mg kg−1) were determined in leaves of Salix × smithiana grown on a soil containing 13.4 mg kg−1 Cd and 955 mg kg−1 Zn, resulting in bioaccumulation factors of 27 (Cd) and 3 (Zn). Total removal of up to 20% Cd and 5% Zn after three vegetation periods were shown for Salix × smithiana closely followed by S. caprea, S. fragilis and S. × dasyclados. While total Cd concentrations in soils were reduced by up to 20%, 1 M NH4NO3-extractable metal concentrations did not significantly decrease within 3 years. Intercropping of S. caprea and A. halleri partly increased total removal of Zn, but did not enhance total Cd extraction compared to single plantings of S. caprea after two vegetation periods.

[1]  S. K. Gupta,et al.  Enhancement of phytoextraction of Zn, Cd, and Cu from calcareous soil: The use of NTA and sulfur amendments , 2000 .

[2]  N. Caille,et al.  Field evaluation of Cd and Zn phytoextraction potential by the hyperaccumulators Thlaspi caerulescens and Arabidopsis halleri. , 2006, Environmental pollution.

[3]  C. Keller,et al.  Phytoextraction capacity of trees growing on a metal contaminated soil , 2003, Plant and Soil.

[4]  J. Eriksson,et al.  Potential of Salix as phytoextractor for Cd on moderately contaminated soils , 2003, Plant and Soil.

[5]  I. Pulford,et al.  Clonal variation in heavy metal uptake by willow. , 1997 .

[6]  M. Kimura,et al.  Effect of application of rice straw and compost on the community structure of bacteria associated with microcrustaceans in the floodwater of a paddy field microcosm , 2003 .

[7]  Alan J. M. Baker,et al.  Metal Hyperaccumulator Plants: A Review of the Ecology and Physiology of a Biological Resource for Phytoremediation of Metal-Polluted Soils , 2000 .

[8]  N. Dickinson,et al.  Phytoremediation Technologies Using Trees , 2005 .

[9]  W. Wenzel,et al.  Hydroponic screening for metal resistance and accumulation of cadmium and zinc in twenty clones of willows and poplars. , 2007, Environmental pollution.

[10]  G. Bañuelos,et al.  Phytoremediation of Contaminated Soil and Water , 1999 .

[11]  E. Meers,et al.  Growth and trace metal accumulation of two Salix clones on sediment-derived soils with increasing contamination levels. , 2005, Chemosphere.

[12]  I. Pulford,et al.  Phytoremediation of heavy metal-contaminated land by trees--a review. , 2003, Environment international.

[13]  B. Clothier,et al.  Cadmium accumulation by willow clones used for soil conservation, stock fodder, and phytoremediation , 2002 .

[14]  N. Lust,et al.  Phytoremediation prospects of willow stands on contaminated sediment: a field trial. , 2003, Environmental pollution.

[15]  Steve P. McGrath,et al.  Uptake of Metals by Plants Sharing a Rhizosphere with the Hyperaccumulator Thlaspi caerulescens , 2002 .

[16]  E. Kothny.  Trace Elements in the Environment , 1973 .

[17]  K. Perttu,et al.  Effects of nutrient supply and soil cadmium concentration on cadmium removal by willow , 2002 .

[18]  H. Felix.  Field trials for in situ decontamination of heavy metal polluted soils using crops of metal-accumulating plants , 1997 .

[19]  Pavel Tlustos,et al.  A comparison of phytoremediation capability of selected plant species for given trace elements. , 2006, Environmental pollution.

[20]  Daniel Hammer,et al.  Root development and heavy metal phytoextraction efficiency: comparison of different plant species in the field , 2003, Plant and Soil.

[21]  Daniel Hammer,et al.  Phytoextraction of Cd and Zn with Salix viminalis in field trials , 2003 .

[22]  G. Stingeder,et al.  Rhizosphere characteristics of the arsenic hyperaccumulator Pteris vittata L. and monitoring of phytoremoval efficiency. , 2003, Environmental science & technology.

[23]  R. Brooks.  Plants that Hyperaccumulate Heavy Metals , 1998 .

[24]  Enzo Lombi,et al.  Plant and rhizosphere processes involved in phytoremediation of metal-contaminated soils , 2001, Plant and Soil.

[25]  Walter W. Wenzel,et al.  Cadmium and zinc accumulation in willow and poplar species grown on polluted soils , 2007 .

[26]  M. Oliveira,et al.  Transgenic plants in phytoremediation: recent advances and new possibilities. , 2005, Environmental science & technology.

[27]  M. Greger,et al.  Differences in uptake and tolerance to heavy metals in Salix from unpolluted and polluted areas , 1996 .

[28]  M. Donn,et al.  Evaluation of extractants for estimation of the phytoavailable trace metals in soils. , 2007, Environmental pollution.

[29]  H. Küpper,et al.  Cellular compartmentation of cadmium and zinc in relation to other elements in the hyperaccumulator Arabidopsis halleri , 2000, Planta.

[30]  M. Günthardt-Goerg,et al.  Diagnosis of abiotic and biotic stress factors using the visible symptoms in foliage. , 2005, Environmental pollution.